that's the last she would have heard from tamerlan. >> we appreciate that. there are other family ties to dig deeper on. katherine russell is the widow of the older brother. investigators want to find out what she may know. tell us what did you find out about this woman. >> just in the last five minutes, katherine russell returned home to her house after a meeting with her lawyer. she went for a meeting. we know he has been speaking with some of those investigators on her behalf. perhaps we are getting closer to the point she may address some of their concerns directly. as they look at the fact that s she shared that cramped apartment with tamerlan tsarn v tsarnaev. she is devastated by this. the investigators want to know exactly what she may have known as they try to piece together what happened and try to determine when and where he may have assembled some of those bombs. that's the reason they want to talk to her. her attorney still tells us she had no idea any of this was going on. anderson. >> i mean, obviously it is understandable why they would want